It's like a spreadsheet, immediately familiar, but much more suitable
for complex data because it's hierarchical.
It's like a mind mapper, but more organized and compact.
It's like an outliner, but in more than one dimension.
It's like a text editor, but with structure.

Have a quick look at what the application looks like on the
screenshots page, see how easy it is to use in the
tutorial, then give it a download (above).
A video someone made (on Linux)

TreeSheets is exceptionally small & fast, so can sit in your system
tray at all times: with several documents loaded representing the equivalent
of almost 100 pages of text, it uses only 5MB of memory on Windows
7 (!)

TreeSheets is free & open source. Enjoy!

Visit this
google group for discussion, bug reports and news updates / releases.
Grab the
source code from GitHub.
google moderator can be used for feature suggestions. Please
donate if you enjoy using this software.
contact the author (Wouter van Oortmerssen) personally.